Means for maintaining a cast coating cylinder in a clean and polished condition



MEANS FOR MAINTAINING A CAST COATING CYLINDER IN A CLEAN AND POLISHED CONDITION Filed Aug. 26, 1955 March 18, 1958 J R METZ 2,826,827

INVENTOR' BY-W-MD ATTORNEY United States Patent 2,826,827 MEANS FOR MAINTATNTNG A CAST COATING CYLINDER IN A CLEAN AND POLISHED CON This invention relates to means for maintaining a cast coating cylinder in a clean and polished condition.

In the cast coating of paper, coating material is applied to one surface of a continuously moving web thereof and which web, subsequent to the application of the coating thereto, is extended around a heated cast coating cylinder. The web of paper is pressed against the surface of the cylinder while same is still wet, and while in this plastic condition the heated cylinder surface dries the paper which is released from the surface with a finish similar to that of the surface of the cylinder.

The finish of the cast coated paper is wholly dependent upon the surface of the cylinder which is initially highly finished for imparting a similar finish to the coated paper surface.

From the above, it is apparent that if the initially highly finished surface of the cylinder is impaired, such as by the adherence of foreign matter thereto, the finished cast coated surface of the web of paper will be correspondingly impaired.

The necessity of maintaining the cast coating cylinder clean has long been recognized and it has heretofore been the general practice to stop the machine and clean the cylinder surface by sundry means when it has beenfound that an interior paper finish was being cast coated thereby.

Such prior practice resulted in considerable loss of cast coating time as well as attendant inconveniences in the cleaning of the cylinder. Furthermore, it has not heretofore been possible to accurately ascertain the need of cleaning prior to the observance of improperly cast coated paper which has passed over the cylinder.

It is accordingly a primary object of this invention to provide means for constantly subjecting the surface of a cast coating cylinder to a cleaning action while a web of paper is being cast coated thereby.

A further object of the invention is the provision of novel means for constantly subjecting the surface of a cast coating cylinder to a cleaning action and to a polishing action simultaneously therewith.

Other objects and advantages of the invention will become apparent in the course of the following detailed description, taken in connection with the accompanying drawing, wherein The single figure of the drawing is a broken end elevational view of a cast coating cylinder and the cylinder cleaning means embodied in the present invention.

Referring in detail to the drawing, the cast coating cylinder is designated at and same is rotatably supported in end bearings 11 (only one of which is shown) in accordance with prevailing practice. At this point it is to be observed that the cleaning means is equally applicable to a metallic belt.

The cylinder is rotatable in the direction of the arrow and such cylinder has a highly finished surface for imparting a similar cast surface on a web of paper 12 which extends around the major portion of such surface in firm contact therewith.

The web of paper 12 has its cylinder engaging surface provided with a coating which may be applied by any of the prevailing means for such purpose. 7

The paper web 12 is guided into engagement with the cylinder 10 at one side of the axis 13 thereof byrne'a'ns of a roller 14, and a second roller 15 is provided for directing the cast coated web away from the cylinder to a suitable winding drum, the paper web traveling in the direction of the arrows thereon.

In the cast coating operation, the highly finished surface of the cylinder 10 provides a facsimile cast surface on the coated side of the paper web 12, and it is imperative that the surface of the cylinder be maintained perfectly clean if a uniform cast coating on the paper be obtained, as is desired.

The present invention comprises a cast coating cylinder surface cleaning means and same is designated in its entirety at 16, and which means is disposed intermediate the rollers 14 and 15. The cleaning means comprises a suitable support 17 adjacent each end of the cylinder 10 and each support is provided with a vertical roll journalling arm 18 and a second vertical arm 19 for a purpose later to appear.

A cylinder cleaning roll or brush 20 has its opposite ends rotatably journaled in the arms 18 as indicated at 21, and the roll or brush is rotated either clockwise or counter-clockwise as indicated by the arrows.

The roll 20 is provided with a cylinder engageable peripheral portion 22 which is of a fibrous nature and which is preferably felt. The said peripheral portion 22 may, however, be a cylindrical brush.

Disposed beneath the roll 20 is a pan 23 which is suitably secured to the supports 17, and which is adapted to contain a liquid and a cleaning powder into which the fibrous portion of the roll or brush 2%) dips and transmits same onto the surface of the cylinder for maintaining same clean.

The cylinder surfaceis not only constantly maintained clean but same is constantly maintained in a polished condition by the following means.

A bar of wax 24 is disposed lengthwise of the roll 29 and same is slidably supported by extensions 25 on the pan 23 with one wall thereof engaged with the fibrous surface of the roll or brush 20.

The wax bar 24 is yieldably urged into contact with the roll by means of springs 26, corresponding ends of which engage the bar and the opposite ends of which engage nuts 27 which are threadedly engaged with studs 28 projecting from arms 19.

From the above, it will be seen that a portion of the cylinder surface is always exposed intermediate the paper web directing rollers 14 and 15 and that the cleaning and polishing roll or brush 20 is constantly engaged therewith, whereby the cylinder surface is always maintained in a clean and polished condition and that the cleaning and polishing is effected during the cast coating operation of the cylinder.

Having set forth my invention in accordance with a preferred structural embodiment thereof, what I claim and desire to secure by U. S. Letters Patent is:

Means for constantly cleaning and polishing the working surface of a cast cylinder during operation thereof on a web of paper initially engaging said surface on a line parallel to the axis of said cylinder and disengaging the surface on a second line parallel to and in spaced relation to the first line; comprising supporting means adjacent each end of said cylinder and including a pair of vertically disposed arms, a cylinder surface cleaning roll rotatably journalled in one of said arms at each end of the cylinder and having a fibrous peripheral working References Cited in the file of this patent surface, a cleaning solution supporting pan disposed be- UNITED STATES PATENTS month said roll and having its opposite ends secured to F saidlast arms; extensions supported by said pan and 41214 uzzard 1864 providing a guide for a bar of wax, and a horizontally 5 958'284 Plant May 1910 disposed coil spring disposed adjacent each end of said 2015'531 Montgomery Sept 1935 roll with corresponding ends thereof engageable with said 1940 bar of wax for urging same into contact with said roll gai i2"' f sur ace, and spring compression ad usting means sup 2,360,825 Blickensderfer H Oct 1944 ported by the others of said arms. 10 

